Lock



Aug. 11, 1925. 1,548,882

I R. c. HEMPHILL LOCK Filed June 30, 1924 INVENTOR 32 ffiaberf 6: Ham 677K A TTORNE. Y

Patented Aug. 11, 1925.

UNITED TES ROBERT C. HEMPI-IILL, OF KANSAS CITY, MISSOURI.

LOCK.

Application filed. .Tune 30, 1924. Serial No. 723,239.

To all whom it may concern:

Be it known that 1, ROBERT C. HEMPHILL, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Locks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to a lock or safety device for closures of openings in buildings and similar structures. The safety device is primarily intended for use in connection with doors but obviously it is not limited to any particular application. I shall however, describe it hereinafter as applied to a door without intending to limit'it in any way to any particular use.

The invention is so constructed that it will be normally held out of functional'position and it will move into functional position only when an effort is being made to unlawfully enter through the opening which it is adapted to guard. In other words, should the invention be applied to a door, the door can be opened and closed in the usual way while the safety lock remains inactive, but when the door is closed and locked, should anyone attempt to force open the door (or jimmy the door), the lock will automatically apply itself.

The novel construction by which I attain the desired result will be apparent by reference to the following description in connection with the accompanying drawings, in which Fig. 1 is a perspective view of the inside of a door and part of the frame showing my invention applied.

Fig. 2 is a similar view of the outside of the door.

Fig. 3 is a cross sectional view through the door and through part of the door frame,

and

Fig. 4 is afragmentary perspective view of two yielding members for causing the mechanism of the safety lock to be set in motion.

The door 1 and the door frame 2 may consist of the usual construction, the door being provided with the usual knob 3 for the lock and the keyhole 4 for turning the tumbler or look bolt. I

My invention in its illustrated embodiment consists of two members 5 and 6, these being inthe form of angles pivoted at 7 and 8 to the door. The meeting ends of the angles 5 and 6 are provided with a lap joint, that is the member 5 is shown as havmg a recess 9, while the member 6 has a tongue 10 to engage the recess which is best shown in Fig. 4. The tongue and groove make a hinged connection between the ends of the members 5 and 6 but the hinged connection is normally held rigid by a keeper plate 11 having a flange 12 which fits over the joint at the ends of the members 5 and 6 to prevent the members 5 and 6 from swinging on their pivots 7 and 8, one of the members for example the one designated 6 is provided with a pin 13 which extends through the door to the inside thereof, the projecting end 1 1 being rectangular in cross section.

The rectangular portion of the pin 13 is adapted to engage in notches 15 and 16 in the reciprocatory stay-bolts 17 and 18 so that the bolts cannot he slid longitudinally while the polygonal portion 14 of the pin 13 engages the notches 15 and 16. The free ends of the stay-bolts 17 and 18 are pointed as at 19 and 20 and they engage notches 21 and 22 in transversely arranged locking bolts 23 and 24.

The locking bolts are mounted to slide on plates 25 and 26 and they are normally urged into projecting position by the springs 27 and 28,'the springs surrounding the bolt pins 29 and 30 as is best seen in Figs. 1 and. 3. The bolts are held from being projected into their keepers 31 and 82 by the engagement of thesharpened ends 19 and 20 with the notches 21 and 22. When, however, an unauthorized person attempts to enter the room closed by the locked door 1, it will be necessary to pry or jimmy the angles 5 and 6 away from the door frame. Since the pin 13 is on one ofthe members 5 or 6, as.

the case may be and since it projects through an opening 33in the door far enough to allow the pin to have sidewise play, it will be apparent that when the member 6 is swung outwardly on its pivot 8, the polygd nal portion 14 will be moved out of both notches 15 and 16, then the springs 27 and 28 will exert their expansive force against the locking bolts to shoot them into the 2 messes keepers 31 and 32. Th door is now locked against the intruder.

I have provided means whereby an authorized person or a person with an authorized key can unlock the door. In order to accom plish this, I provide locks 34 and 35 of appropriate construction having parts adapted to be turned so as to turn the mutilated pin ions 36 and 37 on the inside of the door. These mutilated pinions have relatively flat faces 38 and 39 lying parallel with the edges of the pins 29 and 30 of the bolts 23 and 24. The pins 23 and 24 however are provided with teeth 40 and 41 adapted to be engaged by the teeth of the pinions 36 and 37 so that when the pinions are turned they will engage the teeth in the pins 23 and 2 1 to retract them from their keepers 31 and 32 so that entrances to the room guarded by the locked door may be had. ()f course the springs 27 and. 28 will be strong enough to ride the stay-bolts 17 and 18 out of the notches 19 and 20 when the squared portion 14 of the pin 13 moves out of notches l5 and 16. When, however the squared portion 14 is received in the notches 15 and 16, the springs will be insufficient to project the locking bolts into functional position because the stay bolts will be firmly held in notches 19 and 20.

It will be apparent that a device con structed in accordance with my invention will prevent the entrance of unauthorized persons through openings guarded by a closure such as :a windowor door to which my invention is applied, and it will also be apparent that authorized persons may unlock the closure after the safety device has been caused to function. I o lVhat I claim and desire to secure by Letters-Patent is:

1. A mechanism of the class described comprising a spring actuated bolt and a keeper therefor, an elongated member having an end for engagement with :the bolt to normally hold it in retracted position, a bar having a right angularlyprojecting detent for engaging a notch in the elongated memher to maintain it in functional position with respect to the bolt, the bar having a pivot connection for attachment to a door and means for normally holding the bar against movement, the bar and means being so associated that when the bar is moved transversely, the detent will release the elongated member from engagement with the bolt so that the spring can move the bolt into the keeper.

2. In combination a door frame and a door, a keeper on the door jamb, a bolt for the keeper, on the door a spring normally urging the bolt into engagement with the keeper, an elongated member having an end engaging a notch in the bolt to hold it in retracted position, a bar on the opposite side of the door, a transverse member carried by the bar engaging a notch in the elongated member to hold it against movement and means for normally holding the bar rigid on the door, the bar and elongated member being so associated that when the bar ismoved transversely the transverse member will move out of the notch in the elongated member to permit it to disengage the bolt to permit the spring to urge the bolt into the keeper.

3. In combination, a door and door frame, a spring actuated bolt on one side of the door, a keeper on the door frame to be engaged by the bolt when it is projected by the spring, the bolt having a notch, a longitudinally slidable elongated member on the side of the door carrying the bolt, the mem her having a pointed end for engaging the notch in the bolt, the elongated membenalso having a notch, a normally rigid bar on the other side of the door frame and a detent projection carried by the bar engaging the notch in the elongated member to hold the elongated member against longitudinal movement, the detent permitting the elongated member to move out of engagement with the notch when the bar is pried away from the door, thereby allowing the spring to project the bolt into the keeper.

1. In combination, a door and door frame, a pair of aligning longitudinally movable elongated members on the inside of the door, a pair of spring actuated bolts on the inside of the door having notches engaged by the ends of the elongated members, the bolts being projectable into recesses in the door frame when the elongated members are out of engagement with the notches of the bolts, the bolts having overlapping ends provided with normally aligning notches, a pair of bars pivoted .to the outside of the door and having tongue and notch connections at their adjacent end, a lateral detent member carried by one of the bars for engaging notches in the elongated members to normally hold them in bolt engaging positions, a member normally holding the tongue and notch connection between the bars rigid so that the bars cannot be moved, the detent being controlled by the bars so that when the bars are forced apart the detent will release the elongated members to permit them to bemoved out of engagement with the bolts so that the bolts can be forced by the springs into re cesses in the door frame.

5. In combination, a door and door frame, a pair of aligning longitudinally movable elongated members on the inside of the door, a pair of spring actuated bolts on the inside of the door having notches engaged by the ends of the elongated members, the bolts being projectable into recesses in the door frame when the elongated members are out of engagement with the notches of the bolts,

the elongated members having overlapping ends provided with normally aligning notches, a pair of bars pivoted to the outside of the door and having tongue and notch connections at their adjacent end, a lateral detent member carried by one of the bars for engaging notches in the elongated members to normally hold them in bolt engaging positions, a member normally holding the tongue and notch connection between the bars rigid so that the bars cannot be moved, the detent being controlled by the bars so that when the bars are forced apart the detent will release the elongated members to permit them to be moved out of engagement with the bolts so that the bolts can be forced by the springs into recesses in the door frame, and key controlled pinions having tooth connection with the bolts whereby the bolts can be retracted upon the introduction of a key from the outside of the door.

In testimony whereof I afiix my signature.

ROBERT C. 'HEMPHILL. 

